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 TM 9-2815-220-24
ENGINE PERFORMANCE LOW
THIS WORK PACKAGE COVERS:
Troubleshooting Table and Diagnostic Tests
INITIAL SETUP:
Tools:
Personnel Required
General mechanic's tool kit (item 121, WP 0176)
Track Vehicle Repairer (2) 63H10
Equipment Conditions:
Engine installed in vehicle or ground hop.
CAUTION
If a rough, noisy, or overheated engine is associated with the reported
low power, prior correction of these malfunctions often will eliminate
the poor performance and, in addition, may prevent further damage
to the engine.
When low power or poor vehicle performance is reported, an engine
"stall" speed test will indicate whether the malfunction is engine or
vehicle related.
PRELIMINARY INVESTIGATION
PROBABLE CAUSE
CORRECTIVE ACTION
a. Engine rough operation.
(1) Refer to WP 0014, Engine Rough
Operation.
b. Engine noisy.
(1) Refer to WP 0015, Engine Noisy Operation.
c. Engine overheating.
(1) Refer to WP 0017, Cooling System
Deficiencies.
POWER VERIFICATION: Perform engine "stall" test as follows:
PROCEDURE
OBSERVATION
ANALYSIS
Start engine and warm to normal operating temperature (140 F).
Engine speed below 1800 rpm.
Engine and
With vehicle brakes
transmission partially
applied and
warmed up (not to
transmission in "high
NOTE
normal operating
range," depress
Use a calibrated tachometer for
temperature of 140F).
accelerator pedal fully
"Stall Test".
and operate engine for
CAUTION
20 seconds, release
Limit "Stall Test" to 30-second
accelerator pedal and
intervals maximum, and terminate
allow engine to idle
immediately if transmission warning
1 minute.
light activates.
WP 0019 00-1
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